Docs - additional info

[JakeSidSmith]

• [ ] Add basic chaining example
• [ ] Link to Mozzila documentation for references to original methods
• [ ] Link to data types on Mozzila
• [ ] Find nicer way to display data types
• [ ] Add a way to demonstrate different uses of arguments (e.g. that clip can have none, 1 or 2 arguments, or how drawImage handles cropping)
• [ ] Add information about possible strings that can be used (e.g. text alignment)
• [ ] Explain the points arrays that can be passed to path methods
• [ ] Add demo code to methods that are not obvious